\documentclass{article}
\begin{document}
\begin{figure}[t]
    \centering
\begin{tabular}{|| c | *{2}c | c ||}
\hline
\hline
  42 & 42 & 42 & 42 \\
\hline
  42 & 42 & 42 & 42 \\
\hline
\hline
\end{tabular}
  \caption{test-caption}
  \label{fig:test-label}
\end{figure}
\end{document}
